locale/setlocale.c

   1 /* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <localeinfo.h>
  21 #include <errno.h>
  22 #include <locale.h>
  23 #include <string.h>
  24
  25
  26 /* Switch to the locale called NAME in CATEGORY.
  27    Return a string describing the locale.  This string can
  28    be used as the NAME argument in a later call.
  29    If NAME is NULL, don't switch locales, but return the current one.
  30    If NAME is "", switch to a locale based on the environment variables,
  31    as per POSIX.  Return NULL on error.  */
  32 char *
  33 DEFUN(setlocale, (category, name), int category AND CONST char *name)
  34 {
  35   /* Braindead implementation until I finish the fancy one.  */
  36
  37   if (name == NULL || name[0] == '\0')
  38     return (char *) "C";
  39
  40   if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
  41     return (char *) name;
  42
  43   errno = EINVAL;
  44   return NULL;
  45 }